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Loans and Asset Quality Information (Details 4) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Purchased impaired loans (substantially all of which are covered loans) |  |
Balance, beginning, carrying value | $ 3,142 | $ 4,825
Change due to payments received | (721) | (270)
Transfer to foreclosed real estate |  | (1,316)
Change due to loan charge-off | (31) | (96)
Other | 312 | (1)
Balance, ending, carrying value | 2,702 | 3,142
Contractual Principal Receivable [Member] |  |
Purchased impaired loans (substantially all of which are covered loans) |  |
Balance, beginning, contractual principal | 6,263 | 8,815
Change due to payments received | (548) | (301)
Transfer to foreclosed real estate |  | (2,100)
Change due to loan charge-off | (2) | (150)
Other | 197 | (1)
Balance, ending, contractual principal | 5,910 | 6,263
Fair Value Adjustment Write Down [Member] |  |
Purchased impaired loans (substantially all of which are covered loans) |  |
Balance, beginning, FMV | 3,121 | 3,990
Change due to payments received | 173 | (31)
Transfer to foreclosed real estate |  | (784)
Change due to loan charge-off | 29 | (54)
Other | (115) |
Balance, ending, FMV | $ 3,208 | $ 3,121

X
- Definition Amount of change due to a loan write-off of the allowance for loans. + References No definition available. + Details
Name: | fbp_ChangeDueToLoanChargeoff
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The decrease in amounts due to payments received. + References No definition available. + Details
Name: | fbp_ChangeDueToPaymentsReceived
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of fair value adjustment write down (nonaccretabe difference) of contractual principal receiavble. + References No definition available. + Details
Name: | fbp_FairValueAdjustmentWriteDown
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying value of impaired purchased loans (includes covered and non-covered). + References No definition available. + Details
Name: | fbp_ImpairedPurchasedLoansCarryingValue
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unpaid principal balance of impaired purchased loans with related allowance for credit losses and without related allowance for credit losses. + References No definition available. + Details
Name: | fbp_ImpairedPurchaseLoansUnpaidPrincipalBalance
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Other activity in amounts not disclosed elsewhere in taxonomy. + References No definition available. + Details
Name: | fbp_Other
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | fbp_PurchasedImpairedLoansSubstantiallyAllOfWhichAreCoveredLoansAbstract
Namespace Prefix: | fbp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The value of loans transfered to foreclosed assets. + References No definition available. + Details
Name: | fbp_TransferToForeclosedRealEstate
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration